<!-- start header -->
<header>
	<!-- Fixed navbar -->
	<nav class="navbar navbar-expand-sm navbar-dark bg-dark">
		<a class="navbar-brand" href="/patterns/index">个人博客系统</a>
		<button class="navbar-toggler" type="button" data-toggle="collapse"
			data-target="#navbarsExample03" aria-controls="navbarsExample03"
			aria-expanded="false" aria-label="Toggle navigation">
			<span class="navbar-toggler-icon"></span>
		</button>
	</nav>
</header>
<!-- end header -->
